Ventilator.



H. H. LIND.

VENTILATOR.

APPLICATION FILED APR. 6. I914.

11,222,55% Patented Apr. 10, 1917.

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H. H. LIND.

VENTILATOR.

APPLICATION FILED APR 6, 1914. I LQQQ,MO Patented Apr. 10,1917.

2 SHEETSSHEET 2- if Z1 A if .20

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HERMAN H. LIND, OF LAKEWOOD, OHIO, ASSIGNOR TO THE OHIO BLOWER COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

VENTILA'IOR.

Specification of Letters Patent.

To all whom it may concern:

Be it known that I, HERMAN H. LIND, a citizen of the United States, residing at Lakewood, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Ventilators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to ventilators, and more particularly to ventilators of the rotary-cowl type wherein the exhaust of air through the ventilator is facilitated by the employment of a fan or similar air motor, the said fan or motor being preferably operated by the outside air which circulates around and past the discharge portion of the ventilator. It is a general object of this invention to provide a construction and arrangement whereby the efliciency of such fans or motors is increased, whereby the efficiency of the ventilators is correspondingly increased. With the foregoing general object in view, the invention may be defined further as consisting of the combinations of elements set forth in the claims hereto annexed and illustrated in the drawings forming part hereof, wherein Figure 1 represents a sectional view taken through the upper or discharge end of a ventilator, said ventilator being constructed in accordance with my invention; Fig. 2 is a rear elevation of the ventilator parts shown in the preceding figure; and Fig. 3 a detail in section of one of the bearings for the fan shaft.

Describing by reference characters the various parts illustrated herein 1 denotes the air shaft and 2 the rotary cowl through which the air shaft discharges. This cowl or rotary section is supported from the air shaft by means of an anti-friction bearing, one part 3 whereof is supported at the upper ends of a plurality of upwardly inclined arms 4 projecting into the rotary cowl from the top of the air shaft, the cooperating part of the bearing being carried by inwardly projecting arms 5 secured to the cowl and extending over the converging ends of the arms 4. The details of the bearing as well as the details of the connection between the bearing members and the sections 1 and 2 form no part of the invention in this case, the same being shown, described and claimed in the application of Denton K. Swartwout, N 0. 761,221, filed Apr. 15, 1913.

The cowl portion of the ventilator is of the usual rounded elbow construction arranged to discharge horizontally and provided, in the mouth portion, with a suitable number of spider arms 6 supporting at their central portions an anti-friction bearing 7 (shown in detail in Fig. 3) for the shaft 8, which shaft is provided, in front of the bearing 7, with an exhaust fan the blades whereof are indicated at 9 and which blades extend nearly to the inner wall of the cowl, providing proper clearance therewith.

In closing the top and the sides of the front of the cowl and extending the greater part of the distance from the front to the rear thereof is a hood, the front end whereof is preferably circular in section and of smaller diameter than the discharge end of the cowl. l0 denotes the top wall, 11 the side walls and 12 the bottom walls of the body portion of the-hood (see Fig. 2). The front or receiving end of this hood projects some distance in front of the cowl and is preferably cylindrical, the cylindrical portion being indicated generally by the numeral 13. Within this portion there is mounted another anti-friction bearing 14 for the shaft 8, said bearing being carried by the central portions of the radial spider arms 1.5. In front of said bearing a drive fan is mounted on the shaft 8, the blades of the fan being indicated at 16 and the fan being of such diameter as to provide proper clearance within the inner wall of the cylindrical end 13. The vane 16 may be applied to the discharge end of the cowl in the ordinary manner.

One of the anti-friction bearings is shown in detail in Fig. 3 and, as illustrated, comprises a cone 17 which is loose upon the shaft 8 but which is provided with a lug 18 entering a recess in a collar 19 which is secured to the shaft, as by means of a pin 20. By this construction, the cone is detachably connected to the shaft. 20 denotes the outer Patented Apr. 10, 119117..

ball race which surrounds the cone and between which and the cone the balls 21 are inserted, the otherwise open end of the case being closed by a plate 22.

In operation the vane 16 will function in the usual manner to maintain the discharge or rear end of the cowl away from the wind and the receiving or front end 13 of the hood toward the wind. The wind in proximity to the cowl will pass through the hood and be discharged from the rear end thereof and can exercise its usual aspirating effect upon the discharge end of the cowl. In passing the blades 16 of the drive fan, it will rotate the shaft 8 at a speed dependent upon the velocity of the wind and the resistance required to rotate said shaft. This rotation of the shaft will drive the exhaust fan 9 in the rear or discharge end of the cowl and this fan will serve to exhaust the air through the air shaft and cowl of the ventilator.

By the-construction described and illustrated, a ventilator having a very high exhausting efiiciency is produced. rangement of the hood and the location of the drive fan in said hood contribute largely to such efliciency. By utilizing the full force of the drive fan and by directing the air to said fan through the hood, I am enabled to use a smaller drive fan to operate the exhaust fan than would otherwise be possible. At high wind velocity, the larger exhaust fan serves as a brake on the smaller drive fan to keep its speed of rotation within proper efficiency limits.

Furthermore the drive fan is protected against the weather and the ventilator is not robbed of the air-exhausting effect due to the aspirating action of the air currents about the discharge mouth of the cowl.

Having thus described my invention, what I claim is 1. In a ventilator, an air shaft, a cowl rotatable with respect to said shaft and having a discharge opening arranged to be turned away from the wind, a shaft ournaled within said opening and projecting through the front wall of the cowl, an exhaust fan driven by said shaft and located in the air passageway, a driving fan on said shaft in front of said cowl, and a hood surrounding the last mentioned fan, said hood having an inlet mouth opposite said driving fan and an outlet mouth surrounding said exhaust opening, the outlet opening of said hood being so arranged that the rush of wind therepast will create a suction thereon.

2. In a ventilator, an air shaft, a hood rotatable with respect thereto, said hood hav ing a receiving mouth arranged to face the wind and a discharge opening arranged to be turned away from the wind, an exhaust fan located in operative relation to said air shaft, a driving fan journaled within said The ar.

receiving mouth, and operative connections between said fans, the outletopening of said hood being so arranged that the rush of wind therepast will create a suction thereon.

3. In a ventilator, a hood adapted to be pivoted upon a vertical axis above an air shaft, said hood having a circular inlet mouth arranged to face the wind and having an elongated outlet mouth arranged in the form of an annular segment arranged to be turned away from the wind, an air discharge duct having an inlet end adapted to communicate with the air shaft to which the device is applied and having an outlet end located within the space defined by the outlet mouth of said hood, an exhaust fan in said air duct, a driving fan in said inlet mouth, and means whereby said second fan may drive said first fan.

4. In a ventilator, a hood adapted to be pivoted upon a vertical axis above an air shaft, said hood having a substantially circular inlet mouth arranged with its axis substantially horizontal, and an elongated outlet mouth arranged substantially upon the arc of a circle coaxial therewith, the diameter of said outlet mouth being greater than that of said inlet mouth, an air duct carried by said hood and having an inlet end adapted to communicate with the air shaft to which the device shall be applied and having an outlet end substantially concentric within the outlet mouth of said hood,

a shaft journaled substantially along the axis of said mouths, an exhaust fan carried by said shaft in the outlet end of said duct, a driving fan carried by said shaft inside the inlet mouth of said hood, and means for maintaining said inlet mouth facing the direction from which the wind blows.

5. In a ventilator, the combination of an air shaft, a rotary cowl, a horizontal shaft journaled in said cowl and projecting centrally through the exhaust end thereof, a hood partly surrounding the cowl and having a circular front or receiving end concentric with said shaft, said hood having a narrow elongated outlet mouth partly surrounding said cowl at a point short of its exhaust end, an exhaust fan on said shaft in the discharge portion of the cowl, a driving fan on said shaft within the receiving end of said hood, and a vane carried by said cowl for maintaining said last named fan turned toward the wind.

6. In a ventilator, a hood pivoted upon a vertical axis above an air shaft, said hood having a substantially circular inlet mouth arranged with-its axis substantially horizontal, and an elongated outlet mouth arranged substantially upon the arc of a circle coaxial therewith, the diameter of said outlet mouth being greater than that of said inlet month, an exhaust fan located in operative relation to said air shaft, a driving fan located in said hood, driving connections between said fans, and means for maintaining said inlet mouth facing the direction from Which the Wind blows, said air shaft discharging through the space defined by said annularsegmental outlet mouth.

In testimony whereof, I hereunto afiix my signature in the presence of two Witnesses.

HERMAN H. LIND.

Witnesses:

J. B. HULL, IRENE L. STOHLMAN.

Uopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

